检索结果-南通市图书馆

Endometrial carcinoma with cervical stromal invasion:Three case reports

World Journal of Clinical Cases 2024年第24期12卷 5583-5588页

作者： Ming-Ming Liu Yu-Ting Liang er-Hu Jin Department of Radiology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Department of Radiology Beijing Obstetrics and Gynecology HospitalCapital Medical UniversityBeijing Maternal and Child Health Care HospitalBeijing 100006China

BACKGROUND Endometrial cancer is a kind of well-known tumors of female genitourinary *** stromal invasion is an adverse factor for poor prognosis of endometrial *** is still controversy regarding the use of magnetic resonance imaging(MRI)in the diagnosis of cervical stromal invasion of endometrial *** diagnosis of cervical stromal invasion varies significantly between different observers and *** present a limited case series of the particular pattern of endometrial cancer,which infiltrates the cervical stroma and is often *** SUMMARY We present three cases of endometrial carcinoma with cervical stromal invasion with cancer-free uterine *** patient,a reproductive-aged woman,exhibited irregular menstruation and was diagnosed with endometrial polyps by hysteroscopy and segmental curettage.A MRI scan revealed polypoid nodules within the internal cervical *** other two cases were postmenopausal women who presented with abnormal vaginal *** and segmental curettage suggested atypical hyperplasia of the *** scans did not detect any malignant signs in the *** one case,a nonthickened endometrium was observed,while in another,hyperplasia of the endometrium was ***,none of these patients had malignant tumors identified in the uterine cavity via MRI ***,postoperative pathological results following hysterectomy consistently indicated cervical stromal *** Cervical stromal invasion is easily missed if no cancer is found in the uterine body on *** of endoscopic curettage specimens should be conducted to avoid underestimation of the disease.

关键词： Endometrial carcinoma Cervical stromal invasion Atypical hyperplasia of the endometrium Magnetic resonance imaging Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

循环三轴试验加载频率和压实度对重塑砂土液化行为的影响

引用

岩土力学 2024年第6期45卷 1813-1823页

作者： THUY Do van TIEP Pham Duc HIEU Nguyen van THANG Pham Cao 勒奎东技术大学特殊工程技术研究所越南河内越南航空科技协会越南河内

通过对各向同性固结不排水试样进行循环三轴试验,研究了饱和重塑砂土的液化行为。试验采用恒幅正弦载荷,通过测量剪切模量、阻尼比、轴向应变和超孔隙水压力比的变化,评估了加载频率(分别为0.1、0.5、1.0 Hz)和压实度(分别为0.95、0.90... 详细信息

通过对各向同性固结不排水试样进行循环三轴试验,研究了饱和重塑砂土的液化行为。试验采用恒幅正弦载荷,通过测量剪切模量、阻尼比、轴向应变和超孔隙水压力比的变化,评估了加载频率(分别为0.1、0.5、1.0 Hz)和压实度(分别为0.95、0.90和0.80)对砂土液化行为的影响。试验结果表明,对于压实度为0.95的砂样,在5000次加载循环中,0.1 Hz的加载频率对液化过程影响甚微;而对于压实度为0.90和0.80的砂样,此频率的影响显著。对于压实度为0.80的砂样,当频率增加到0.5 Hz时几乎一加载就直接发生液化。这表明增加加载频率会加快液化速度,而增加压实度则会减慢液化速度。因此,通过一系列的试验可以模拟现场砂土在不同频率下的动荷载条件。试验结果表明,饱和砂土的液化行为由以下因素决定:(1)试样的压实度越低,液化越容易发生;(2)加载频率越高,液化越容易发生;(3)循环轴向应变越大,发生液化所需的循环次数越少;(4)超孔隙水压力随加载循环次数增加,直至试样完全液化。

关键词：液化行为加载频率循环三轴试验饱和固结不排水条件重塑砂土压实度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Myocarditis–A silent killer in athletes:Comparative analysis on the evidence before and after COVID-19 pandemic

引用

Sports Medicine and Health Science 2024年第3期6卷 232-239页

作者： Jonathan van Name Kainuo Wu Lei Xi Virginia Commonwealth University School of Medicine(M.D.Class 2024) RichmondVA23298USA Pauley Heart Center Division of CardiologyDepartment of Internal MedicineVirginia Commonwealth UniversityRichmondVA23298-0204USA

Myocarditis is a rare cardiomyocyte inﬂammatory process,typically caused by viruses,with potentially devastating cardiac sequalae in both competitive athletes and in the general *** into myocarditis prevalence in the Coronavirus disease 2019(COVID-19)era suggests that infection with Severe acute respiratory syndrome coronavirus(SARS-CoV-2)is an independent risk factor for myocarditis,which is conﬁrmed mainly through cardiovascular magnetic resonance *** studies indicated that athletes have a decreased risk of myocarditis after recent COVID-19 infection compared to the general ***,given the unique nature of competitive athletics with their frequent participation in high-intensity exercise,athletes possess distinct factors of susceptibility for the development of myocarditis and its subsequent severe cardiac complications(e.g.,sudden cardiac death,fulminant heart failure,etc.).Under this context,this review focuses on comparing myocarditis in athletes versus non-athletes,owing special attention to the distinct clinical presentations and outcomes of myocarditis caused by different viral pathogens such as cytomegalovirus,Epstein-Barr virus,human herpesvirus-6,human immunodeﬁciency virus,and Parvovirus B19,both before and after the COVID-19 pandemic,as compared with *** illustrating distinct clinical presentations and outcomes of myocarditis in athletes versus non-athletes,we also highlight the critical importance of early detection,vigilant monitoring,and effective management of viral and non-viral myocarditis in athletes and the necessity for further optimization of the return-to-play guidelines for athletes in the COVID-19 era,in order to minimize the risks for the rare but devastating cardiac fatality.

关键词： COVID-19 Myocarditis Cardiovascular symptomatology Athlete susceptibility Return-to-play Sudden cardiac death Viral pathogens High-intensity exercise

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Are school uniforms associated with gender inequalities in physical activity? A pooled analysis of population-level data from 135 countries/regions

引用

Journal of Sport and Health Science 2024年第4期13卷 590-598页

作者： Mairead Ryan Luiza I.C.Ricardo Nicole Nathan Riikka Hofmann Esther van Sluijs Medical Research Council Epidemiology Unit University of CambridgeCambridge CB20QQUK Faculty of Education University of CambridgeCambridge CB28PQUK Hunter New England Population Health WallsendNSW 2287Australia School of Medicine and Public Health College of HealthMedicine and WellbeingUniversity of NewcastleCallaghanNSW 2308Australia Hunter Medical Research Institute New Lambton HeightsNSW 2305Australia National Centre of Implementation Science University of NewcastleCallaghanNSW 2308Australia

Purpose:It is aimed to assess whether school uniforms are associated with population-level gender inequalities in physical activity,and whether associations differ by school level,country/region income,and assessment ***:An ecological study design was *** collected data about global uniform practices using an online *** searched for country/region-level estimates of school-aged youth meeting physical activity guidelines from international surveillance *** selection was conducted in duplicate using a systematic process,and a random sample of all data was checked to ensure extraction and pooling processes were *** calculated absolute and relative gender inequalities in physical activity for each *** regression examined associations between country/region-level uniform practices(binary yes/no exposure variable) and country/region-level gender inequalities in physical activity guideline compliance(absolute and relative inequalities).We investigated moderation by school level,stratified analyses by income group,and repeated primary analyses using device-measured ***:Pooling data from 135 countries/regions(n=1,089,852),we found no association between population-level uniform practices and gender inequalities in physical activity across all ages(absolute:β=-0.2;95% confidence interval(95%CI):-1.7 to 1.3,p=0.74;relative:β=0.1;95%CI:-0.1 to 0.2,p=0.51).Subgroup analysis suggested a positive association in primary school settings(absolute:β=4.3;95%CI:-0.0 to 8.6,p=0.05).Among high-income countries,absolute inequalities were significantly greater in countries/regions with uniform practices(N=37) compared to those without(N=48)(9.1(SD=3.6) vs.7.8 percentage points(SD=4.3)).Repeating analyses using device-measured data(n=32,130;N=24) did not alter our primary *** initial descriptive statistics,we found that in countries/regions where a maj ority of schools(>50%) reportedly use uniforms,there was lower compli

关键词： School policy Clothing Child Adolescent Accelerometer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effective Utilization of Government-Provided CTI by Small Businesses within the Defense Industrial Base

引用

Journal of Information Security 2024年第2期15卷 196-217页

作者： Josiah Dykstra Lawrence A. Gordon Martin P. Loeb Benjamin wall Lei Zhou National Security Agency Fort Meade MD USA Robert H. Smith School of Business University of Maryland College Park MD USA

There are two broad objectives of the research reported in this paper. First, we assess whether government-provided cyber threat intelligence (CTI) is helpful in preventing, or responding to, cyber-attacks among small businesses within the U.S. Defense Industrial Base (DIB). Second, we identify ways of improving the effectiveness of government-provided CTI to small businesses within the DIB. Based on a questionnaire-based survey, our findings suggest that government-provided CTI helps businesses within the DIB in preventing, or responding to, cyber-attacks providing a firm is familiar with the CTI. Unfortunately, a large percentage of small firms are not familiar with the government-provided CTI feeds and consequently are not utilizing the CTI. This latter situation is largely due to financial constraints confronting small businesses that prevent firms from having the wherewithal necessary to effectively utilize the government-provided CTI. However, we found a significant positive association between a firm’s familiarity with the government-provided CTI and whether a firm is being periodically reviewed by the Defense Counterintelligence and Security Agency (DCSA) or is compliant with the Cybersecurity Maturity Model Certification (CMMC) program. The findings from our study also show that the participating firms believe that external cyber threats are more likely to be the cause of a future cybersecurity breach than internal cybersecurity threats. Finally, our study found that the portion of the IT budget that small businesses within the DIB spend on cybersecurity-related activities is dependent on the perception that a firm would be the target of an external cyber-attack.

关键词： Government-Provided CTI Small Businesses Defense Industrial Base

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Editorial for Special Issue on Multi-modal Representation Learning

引用

Machine Intelligence Research 2024年第4期21卷 615-616页

作者： Deng-Ping Fan Nick Barnes Ming-Ming Cheng Luc van Gool Nankai University China&ETH ZürichSwitzerland Australian National University Australia Nankai University China ETH Zürich Switzerland

The past decade has witnessed the impressive and steady development of single-modal AI technologies in several fields,thanks to the emergence of deep *** studied,however,is multi-modal AI-commonly considered the next generation of AI-which utilizes complementary context concealed in different-modality inputs to improve *** naturally learn to form a global concept from multiple modalities(i.e.,sight,hearing,touch,smell,and taste),even when some are incomplete or ***,in addition to the two popular modalities(vision and language),other types of data such as depth,infrared information,and events are also important for multi-modal learning in real-world scenes.

关键词： modal utilize incomplete

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The shear strength of the interface between artificial rock and printed concrete at super-early ages

引用

Frontiers of Structural and Civil Engineering 2024年第1期18卷 51-65页

作者： Yong Yuan Xiaoyun Wang Jiao-Long Zhang Yaxin Tao Kim van Tittelboom Luc Taerwe Geert De Schutter College of Civil Engineering Tongji UniversityShanghai 200092China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Belgium-China Joint Laboratory for Industrialized Construction Tongji UniversityShanghai 200092China Magnel-vandepitte Laboratory for Structural Engineering and Building Materials Ghent UniversityGhent 9052Belgium

3D concrete printing has the potential to replace shotcrete for construction of linings of tunnels in hard *** shear strength of the interface between rock and printed concrete is vital,especially at super-early ***,traditional methods for testing the shear strength of the interface,e.g.,the direct shear test,are time-consuming and result in a high variability for fast-hardening printed *** this paper,a new fast bond shear test is *** test can be completed in 1 min,with another 2 min for preparing the next *** influence of the matrix composition,the age of the printed matrices,and the interface roughness of the artificial rock substrate on the shear strength of the interface was experimentally *** tests were conducted at the age of the matrices at the 1st,the 4th,the 8th,the 16th,the 32nd,and the 64th min after its final setting.A dimensionless formula was established to calculate the shear strength,accounting for the age of the printed matrices,the interface roughness,and the shear failure *** was validated by comparing the calculated results and the experimental results of one group of samples.

关键词： rock tunnel printed concrete interface fast bond shear test shear strength

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高分辨率罗兰圆光学系统的色差校正方法研究

引用

光谱学与光谱分析 2024年第7期44卷 2011-2017页

作者：陈吉文陈作儿北方工业大学电气与控制工程学院北京100144

罗兰圆光学系统优点众多,但系统中因平凸透镜的使用,导致各特征波长色散后的成像点在罗兰圆附近产生了一定量的偏移量,使得各波长成像点依次排列在一条曲面上。由于目前新型采集器件线阵CMOS或CCD的使用,而这类传感器的感光面是一个平面... 详细信息

罗兰圆光学系统优点众多,但系统中因平凸透镜的使用,导致各特征波长色散后的成像点在罗兰圆附近产生了一定量的偏移量,使得各波长成像点依次排列在一条曲面上。由于目前新型采集器件线阵CMOS或CCD的使用,而这类传感器的感光面是一个平面,因此导致结果产生较严重的色差。提出了一种使用加权最小二乘法拟合像面的色差校正方法,并计算出系统像面的中心偏移距和偏移倾斜角这两个校正参数,将其引入原本罗兰圆光学系统进行色差校正,从而确定线阵光电传感器像面的最佳位置,实现高分辨率。此外在真空紫外光谱中C、P和S等元素非常重要,可使用本文提出的基于加权最小二乘法的色差校正方法,通过增加这类元素权值占比,实现最优分辨率。最后通过Zemax软件进行光学仿真,完成了罗兰圆光学系统的仿真以及优化。并给出170~410 nm波段点列图的成像宽度仿真以及各元素特征波长在CMOS传感器上所采集到的光谱图,推算出其实际应用中的分辨率,其照度光谱图显示其分辨率均可保持在0.02 nm,接近系统理论最佳分辨率。研究结果表明基于加权最小二乘法拟合像面的方法,可实现罗兰圆光学系统的色差校正,实现高分辨率。

关键词：罗兰圆光学系统平凸透镜色差校正高分辨率加权最小二乘法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of solution treatment on the microstructure,phase transformation behavior and functional properties of NiTiNb ternary shape memory alloys fabricated via laser powder bed fusion in-situ alloying

引用

International Journal of Extreme Manufacturing 2024年第4期6卷 202-223页

作者： Rui Xi Hao Jiang Guichuan Li Zhihui Zhang Huiliang Wei Guoqun Zhao Jan van Humbeeck Xiebin Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJingshi Road 17923Jinan 250061People's Republic of China Department of Materials Engineering University of Leuven(KU Leuven)Kasteelpark Arenberg 44 bus 2450Heverlee B3001Belgium Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityRenmin Street 5988Changchun 130025People's Republic of China School of Mechanical Engineering Nanjing University of Science and TechnologyXiaolingwei Street 200Nanjing 210094People's Republic of China

Post-heat treatment is commonly employed to improve the microstructural homogeneity and enhance the mechanical performances of the additively manufactured metallic *** this work,a ternary(NiTi)91Nb9(at.%)shape memory alloy was produced by laser powder bed fusion(L-PBF)using pre-alloyed NiTi and elemental Nb *** effect of solution treatment on the microstructure,phase transformation behavior and mechanical/functional performances was *** in-situ alloyed(NiTi)91Nb9 alloy exhibits a submicron cellular-dendritic structure surrounding the supersaturated B2-NiTi *** high-temperature(1273 K)solution treatment,Nb-rich precipitates were precipitated from the supersaturated *** fragmentation and spheroidization of the NiTi/Nb eutectics occurred during solution treatment,leading to a morphological transition from mesh-like into rod-like and *** of theβ-Nb phases occurred with increasing holding *** martensite transformation temperature increases after solution treatment,mainly attributed to:(i)reduced lattice distortion due to the Nb expulsion from the supersaturated B2-NiTi,and(ii)the Ti expulsion from theβ-Nb phases that lowers the ratio Ni/Ti in the B2-NiTi matrix,which resulted from the microstructure changes from non-equilibrium to equilibrium *** thermal hysteresis of the solutionized alloys is around 145 K after 20%pre-deformation,which is comparable to the conventional NiTiNb alloys.A short-term solution treatment(*** 1273 K for 30 min)enhances the ductility and strength of the as-printed specimen,with the increase of fracture stress from(613±19)MPa to(781±20)MPa and the increase of fracture strain from(7.6±0.1)%to(9.5±0.4)%.Both the as-printed and solutionized samples exhibit good tensile shape memory effects with recovery rates>90%.This work suggests that post-process heat treatment is essential to optimize the microstructure and improve the mechanical performances of the L-PBF in-situ allo

关键词： shape memory alloy NiTiNb laser powder bed fusion in-situ alloying heat treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

无电荷层InGaAs/Si雪崩光电探测器的优化设计

引用

光学学报 2024年第5期44卷 19-28页

作者：张娟姚儿柯少颖闽南师范大学物理与信息工程学院光场调控及其系统集成应用福建省高校重点实验室福建漳州363000

目前,在近红外波段中普遍采用InGaAs/InP雪崩光电二极管(APD),但这类APD存在增益带宽积小和等效噪声高等问题,而InGaAs/Si APD采用电子、空穴离化系数极低的Si材料作为倍增层,在一定程度解决了上述问题,但其制造过程涉及Si电荷层的离子... 详细信息

目前,在近红外波段中普遍采用InGaAs/InP雪崩光电二极管(APD),但这类APD存在增益带宽积小和等效噪声高等问题,而InGaAs/Si APD采用电子、空穴离化系数极低的Si材料作为倍增层,在一定程度解决了上述问题,但其制造过程涉及Si电荷层的离子注入和高温退火激活,该过程工艺复杂、杂质分布不均匀、成本高。因此,本研究采用刻蚀技术在Si倍增层内制备凹槽环,并在凹槽环内填充不同介质对InGaAs层及Si层内的电场进行调控,构建无电荷层InGaAs/Si APD器件模型。结果表明,在凹槽环内填充空气或SiO2可获得高性能的InGaAs/Si APD。该研究结果可为后续研制工艺简单、性能稳定、低噪声的InGaAs/Si APD提供理论指导。

关键词：探测器雪崩光电二极管增益带宽积电荷层凹槽环

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：